Shield: Spear HP Buffs + Shield Buffs can be a Great Buff for Divine Attend, Of course, Sacred Shield and the other buffs can help u a lot too.

Wraith: Wraith is in this case is for PVE, Wraith will not help u a lot on PVP. Only Protection and chance to revive if u get killed but... Nothing more.

Avatar: Extra %Atk Buff and Deceptive Clone, The survivality of the clone may be a nice help Vs. Debuffs (Debuff no... Stun -.-), Assassins and nukes.

Personally i choose Shield... Stun + Protection + Regeneration is very nice supposing you have HP Buff, Def/SD Buffs. Wraith for Warriors is not better than Shield i think. Of course... The protection of Wraith is super usefull, but its an opinion only. Avatar i think... Is very limited, Extra %Damage and Survivality what dont stacks... Shield is a lot better, and the Bubble of Shield can absorb more damage than the clone.

I suppose that if he asked for a build that has spear as main it is beacuse he will use spear to attack so my question is... if you use the bubble from shield and later you switch weapon to spear the bubble disappear or not? because if disappear It would not be very useful to have a shield apart from the regeneration buff or stun

if u want to be main spear..and pvp with only spear ..best build for you will be
spear+shield+reserve+assault+wraith+mantle/Garment
i tested this build and it works for me..
if u are lvl 250skills shield is your best friend.. with shield heal buff+bubble+stun and wraith rebound+heal/hit from spear u will be a beast ^^
give it a try if u got good stats/equips
this build is only for great equips